void VirtualMemoryManager::Lock(void *ptr)
{
if(!inited)
return;
LockMut(vmemMutex);
// check that the address is within the virtual address bounds
if((DWORD)ptr < baseAddress || (DWORD)ptr >= baseAddress + (totalPages * pageSize))
{
return;
}
// find the page(s) to free
DWORD offset = (DWORD)ptr - baseAddress;
unsigned long pageIndex = offset / pageSize;
if(pages[pageIndex].headPage == -1)
{
return;
}
pageIndex = pages[pageIndex].headPage;
unsigned long endPage = pageIndex + pages[pageIndex].sizeInPages;
if(!pages[pageIndex].committed)
{
if(!PageFault(ptr))
return;
}
for(unsigned long i = pageIndex; i < endPage; i++)
{
pages[i].locked = true;
}
}
void DispatchException (struct ContextState *es)
{
int privilege_level;
int pf_direction;
vm_addr pf_addr;
if (isr_depth > 0)
PrintException (es, "Exception in interrupt Handler", TRUE);
if (es->return_eflags & EFLG_VM)
{
KPANIC ("V86 Exception");
switch (es->exception)
{
case EXCEPTION_GP:
EnableInterrupts();
V86GPHandler (es);
DisableInterrupts();
break;
default:
PrintException (es, "#GP in V86", TRUE);
}
}
else if ((privilege_level = es->return_cs & 0x03) == 0)
{
switch (es->exception)
{
case EXCEPTION_PF:
pf_addr = GetCR2();
if ((es->error_code & PF_ERRORCODE_DIRECTION) == 0)
pf_direction = PF_DIR_READ;
else
pf_direction = PF_DIR_WRITE;
EnableInterrupts();
if (PageFault (pf_addr, pf_direction, privilege_level) != 0)
{
if (current_process->archproc.resume_eip != 0 &&
current_process->archproc.resume_esp != 0)
{
es->return_eip = current_process->archproc.resume_eip;
es->return_esp = current_process->archproc.resume_esp;
current_process->archproc.resume_eip = 0;
current_process->archproc.resume_esp = 0;
}
else
{
PrintException (es, "#PF in Kernel", TRUE);
}
}
DisableInterrupts();
break;
default:
PrintException (es, "Exception in Kernel", TRUE);
}
}
else
{
switch (es->exception)
{
case EXCEPTION_DE: /* Divide Error */
current_process->usignal.sig_pending |= SIGFFPE;
current_process->usignal.siginfo_data[SIGFPE-1].si_signo = SIGFPE;
current_process->usignal.siginfo_data[SIGFPE-1].si_code = 0;
current_process->usignal.siginfo_data[SIGFPE-1].si_value.sival_int = 0;
break;
case EXCEPTION_DB: /* Debug */
current_process->usignal.sig_pending |= SIGFTRAP;
current_process->usignal.siginfo_data[SIGTRAP-1].si_signo = SIGTRAP;
current_process->usignal.siginfo_data[SIGTRAP-1].si_code = 0;
current_process->usignal.siginfo_data[SIGTRAP-1].si_value.sival_int = 0;
break;
case EXCEPTION_NMI: /* Non-Maskable Interupt */
break;
case EXCEPTION_BP: /* Breakpoint */
current_process->usignal.sig_pending |= SIGFTRAP;
current_process->usignal.siginfo_data[SIGTRAP-1].si_signo = SIGTRAP;
current_process->usignal.siginfo_data[SIGTRAP-1].si_code = 0;
current_process->usignal.siginfo_data[SIGTRAP-1].si_value.sival_int = 0;
break;
case EXCEPTION_OF: /* Overflow */
current_process->usignal.sig_pending |= SIGFSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_signo = SIGSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_code = 0;
current_process->usignal.siginfo_data[SIGSEGV-1].si_value.sival_int = 0;
break;
case EXCEPTION_BR: /* Boundary-Range Exceeded */
current_process->usignal.sig_pending |= SIGFSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_signo = SIGSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_code = 0;
current_process->usignal.siginfo_data[SIGSEGV-1].si_value.sival_int = 0;
break;
case EXCEPTION_UD: /* Undefined-Opcode */
current_process->usignal.sig_pending |= SIGFILL;
current_process->usignal.siginfo_data[SIGILL-1].si_signo = SIGILL;
current_process->usignal.siginfo_data[SIGILL-1].si_code = 0;
current_process->usignal.siginfo_data[SIGILL-1].si_value.sival_int = 0;
break;
case EXCEPTION_NM: /* Device-Not Available */
current_process->usignal.sig_pending |= SIGFSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_signo = SIGSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_code = 0;
current_process->usignal.siginfo_data[SIGSEGV-1].si_value.sival_int = 0;
break;
case EXCEPTION_DF: /* Double-Fault */
KPANIC ("DF");
break;
case EXCEPTION_CSO: /* Reserved : Coprocessor Segment Overrun */
current_process->usignal.sig_pending |= SIGFFPE;
current_process->usignal.siginfo_data[SIGFPE-1].si_signo = SIGFPE;
current_process->usignal.siginfo_data[SIGFPE-1].si_code = 0;
current_process->usignal.siginfo_data[SIGFPE-1].si_value.sival_int = 0;
break;
case EXCEPTION_TS: /* Invalid TSS */
current_process->usignal.sig_pending |= SIGFSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_signo = SIGSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_code = 0;
current_process->usignal.siginfo_data[SIGSEGV-1].si_value.sival_int = 0;
break;
case EXCEPTION_NP: /* Segment / Not Present */
current_process->usignal.sig_pending |= SIGFBUS;
current_process->usignal.siginfo_data[SIGBUS-1].si_signo = SIGBUS;
current_process->usignal.siginfo_data[SIGBUS-1].si_code = 0;
current_process->usignal.siginfo_data[SIGBUS-1].si_value.sival_int = 0;
break;
case EXCEPTION_SS: /* Stack Segment */
current_process->usignal.sig_pending |= SIGFBUS;
current_process->usignal.siginfo_data[SIGBUS-1].si_signo = SIGBUS;
current_process->usignal.siginfo_data[SIGBUS-1].si_code = 0;
current_process->usignal.siginfo_data[SIGBUS-1].si_value.sival_int = 0;
break;
case EXCEPTION_GP: /* General Protection */
current_process->usignal.sig_pending |= SIGFSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_signo = SIGSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_code = 0;
current_process->usignal.siginfo_data[SIGSEGV-1].si_value.sival_int = 0;
break;
case EXCEPTION_PF:
pf_addr = GetCR2();
if ((es->error_code & PF_ERRORCODE_DIRECTION) == 0)
pf_direction = PF_DIR_READ;
else
pf_direction = PF_DIR_WRITE;
EnableInterrupts();
if (PageFault (pf_addr, pf_direction, privilege_level) != 0)
{
current_process->usignal.sig_pending |= SIGFSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_signo = SIGSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_code = 0;
current_process->usignal.siginfo_data[SIGSEGV-1].si_value.sival_int = 0;
PrintException (es, "Page Fault in PL3", FALSE);
}
DisableInterrupts();
break;
case EXCEPTION_RESV: /* Reserved */
break;
case EXCEPTION_MF: /* Math Fault */
current_process->usignal.sig_pending |= SIGFFPE;
current_process->usignal.siginfo_data[SIGFPE-1].si_signo = SIGFPE;
current_process->usignal.siginfo_data[SIGFPE-1].si_code = 0;
current_process->usignal.siginfo_data[SIGFPE-1].si_value.sival_int = 0;
break;
case EXCEPTION_AC: /* Alignment Check */
current_process->usignal.sig_pending |= SIGFSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_signo = SIGSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_code = 0;
current_process->usignal.siginfo_data[SIGSEGV-1].si_value.sival_int = 0;
break;
case EXCEPTION_MC: /* Machine Check */
break;
case EXCEPTION_XF: /* Extended Math Fault */
current_process->usignal.sig_pending |= SIGFFPE;
current_process->usignal.siginfo_data[SIGFPE-1].si_signo = SIGFPE;
current_process->usignal.siginfo_data[SIGFPE-1].si_code = 0;
current_process->usignal.siginfo_data[SIGFPE-1].si_value.sival_int = 0;
break;
default: /* Unknown Exception */
current_process->usignal.sig_pending |= SIGFSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_signo = SIGSEGV;
current_process->usignal.siginfo_data[SIGSEGV-1].si_code = 0;
current_process->usignal.siginfo_data[SIGSEGV-1].si_value.sival_int = 0;
break;
}
}
}
